Submitted by la334 on Thu, 27/11/2025 - 10:30
Four major turning points at ages 9, 32, 66, and 83 mark five broad eras of neural wiring over the average human lifespan.
Neuroscientists at the University of Cambridge have identified five “major epochs” of brain structure over the course of a human life, as our brains rewire to support different ways of thinking. At the same time, we grow, mature, and ultimately decline.
A new study led by Dr Alexa Mousley (MRC Cognition and Brain Sciences Unit) and Professor Duncan Astle (MRC-CBU/Robinson College) has identified five distinct eras of brain structure across the average human lifespan, with key turning points at ages 9, 32, 66, and 83.
The study led by Cambridge’s MRC Cognition and Brain Sciences Unit compared the brains of 3,802 people between zero and ninety years old using datasets of MRI diffusion scans, which map neural connections by tracking how water molecules move through brain tissue.
In a study published in Nature Communications, scientists say they detected five broad phases of brain structure across the average human lifespan, divided by four pivotal “turning points” between birth and death when our brains reconfigure.
Childhood brain “topology” runs from birth until a turning point at the age of nine, when it transitions to the adolescent phase – an era that lasts right up to the age of 32, on average.
In our early thirties, the brain’s neural wiring shifts into adult mode. This is the longest era, which lasts over three decades. A third turning point around age 66 marks the start of an “early ageing” phase of brain architecture. Finally, the “late ageing” brain takes shape at around 83 years old.
“We know the brain’s wiring is crucial to our development, but we lack a big picture of how it changes across our lives and why,” said Dr Alexa Mousley, a Gates Cambridge Scholar who led the research.
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